linux-kernel - Re: [PATCH v2 08/11] KVM: x86: Print error code in exception injection tracepoint iff valid

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Date:   Thu, 28 Apr 2022 12:49:44 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Maciej S . Szmigiero" <maciej.szmigiero@...cle.com>
Subject: Re: [PATCH v2 08/11] KVM: x86: Print error code in exception
 injection tracepoint iff valid

On Sat, 2022-04-23 at 02:14 +0000, Sean Christopherson wrote:
> Print the error code in the exception injection tracepoint if and only if
> the exception has an error code.  Define the entire error code sequence
> as a set of formatted strings, print empty strings if there's no error
> code, and abuse __print_symbolic() by passing it an empty array to coerce
> it into printing the error code as a hex string.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kvm/trace.h | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index d07428e660e3..385436d12024 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -376,10 +376,11 @@ TRACE_EVENT(kvm_inj_exception,
>  		__entry->reinjected	= reinjected;
>  	),
>  
> -	TP_printk("%s (0x%x)%s",
> +	TP_printk("%s%s%s%s%s",
>  		  __print_symbolic(__entry->exception, kvm_trace_sym_exc),
> -		  /* FIXME: don't print error_code if not present */
> -		  __entry->has_error ? __entry->error_code : 0,
> +		  !__entry->has_error ? "" : " (",
> +		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }),
> +		  !__entry->has_error ? "" : ")",
>  		  __entry->reinjected ? " [reinjected]" : "")
>  );
>  



Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Good idea to do it in few more places, I'll keep that in mind.

Best regards,
	Maxim Levitsky